If -0.1 is not ODD, then it's Even...
Parity is defined only on integers so this is not true here. Strictly speaking, it should be undefined. Or with the current definition the function could be called isOddInteger. Although it still looks acceptable for me as it is.

I have the same problem, it happens in JavaScript.
It's exactly the same string.

Expected: □ ■ □ ■ ■ □ ■ □ □ ■ □ ■ ■ □ ■ □, instead got: □ ■ □ ■ ■ □ ■ □ □ ■ □ ■ ■ □ ■ □